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Finding the Fourth Proportional to 1,261.51, 1,893.61 and 714.76

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Solution

The fourth proportional to 1,261.51, 1,893.61 and 714.76 is: 1,072.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.51 : 1,893.61 = 714.76 : x
  2. Step 2: Convert to fraction form
    1,261.51/1,893.61 = 714.76/x
  3. Step 3: Cross multiply
    1,261.51x = 1,893.61 × 714.76
  4. Step 4: Simplify right side
    1,261.51x = 1,353,472.84
  5. Step 5: Solve for x
    x = 1,353,472.84/1,261.51
  6. Step 6: Final answer
    x = 1,072.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.